<!DOCTYPE html>
<html lang="zh-cn">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>五子棋</title>
    <style>
        .canvas {
            display: block;
            margin: 50px auto;
            box-shadow: -2px -2px 2px #EFEFEF, 5px 5px 5px #B9B9B9;
        }
    </style>
</head>

<body>
    <canvas id="canvas" class="canvas" width="450" height="450"></canvas>
    <script src="./index.js"></script>
</body>

</html>